Rothoblaas - Wood screws and connectors Page 65
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STATIC VALUES | BEECH LVL CHARACTERISTIC VALUES EN 1995:2014 TENSION(3) SHEAR geometry LVL - LVL thin steel-LVL plate(1) thick steel-LVL plate(2) thread withdrawal(4) steel tension head pull-through(5) A L b d1 b A RV,k Rax,k Rtens,k Rhead,k [kN] [kN] [kN] [kN] 6 80 50 30 5,19 6 100 60 40 5,19 6 120 70 50 5,19 6 140 80 60 5,19 6,54 6,77 6,77 6,77 12,60 7,20 15,12 7,20 9,20 17,64 9,29 20,16 18,00 7,20 7,20 6 160 90 70 5,19 9,29 22,68 7,20 120 70 50 8,19 11,13 13,75 23,52 10,51 8 140 80 60 8,19 11,13 14,59 26,88 10,51 8 160 90 70 8,19 8 180 100 80 8,19 8 200 100 100 8,19 8 220 100 120 8,19 8 240 100 140 8,19 6,77 7,94 8,57 8 11,13 11,13 11,13 11,13 SPLATE = 8 mm 9 RV,k [kN] SPLATE = 4 mm 7 RV,k [kN] SPLATE = 6 mm L [mm] [mm] [mm] [mm] [mm] SPLATE = 3 mm d1 eq. d1 11,13 15,43 30,24 15,74 33,60 10,51 32,00 10,51 15,74 33,60 10,51 15,74 33,60 10,51 15,74 33,60 10,51 NOTES: GENERAL PRINCIPLES: (1) The shear resistance characteristics are calculated considering the case of • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. a thin plate (SPLATE ≤ 0,5 d1). (2) The shear resistance characteristics are calculated considering the case of • Design values can be obtained from characteristic values as follows: a thick plate (SPLATE ≥ d1). (3) The tensile design strength of the connector is the lower between the tim- ber-side design strength (Rax,d) and the steel-side design strength (Rtens,d). Rax,d = min Rax,k kmod γM Rtens,k γM2 (4) The axial thread withdrawal resistance was calculated considering a 90° an- gle between the grain and the connector and for a fixing length of b. (5) The axial resistance to head pull-through was calculated using LVL beech elements. In the case of steel-to-timber connections, generally the steel tensile strength is binding with respect to head separation or pull-through. Rd = Rk kmod γM The coefficients γM and kmod should be taken according to the current regulations used for the calculation. • For the mechanical resistance values and the geometry of the screws, reference was made to ETA-11/0030. • For the calculation process a mass density equal to ρk = 730 kg/m3 has been considered for LVL beech elements. • Values were calculated considering the threaded part as being completely inserted into the wood. • Sizing and verification of the timber elements, panels and steel plates must be done separately. • The characteristic shear strength are calculated for screws inserted without pre-drilling hole. CARPENTRY | HBS HARDWOOD | 65
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